I have been exploring my new B1.
As part of the process, I downloaded a number of YouTube videos which I subsequently deleted.
These videos no longer appear in the Web UI but do still play (ie they play, in sequence, after another "real" video has finished). This, then, repeats (presumably indefinitely).
Also the number of YouTube videos recorded in the "Settings" far exceeds the actual number of videos shown under YouTube History - in fact the number in "Settings" is probably the total number of all those in the History plus all those (supposedly) deleted.
Any suggestions as to what is going on and how can I really remove the unwanted YouTubes from my B1?